/** * Encrypt a message. * * @param paddedMessage The plaintext message bytes, optionally padded to a constant multiple. * @return A ciphertext message encrypted to the recipient+device tuple. */ public CiphertextMessage encrypt(byte[] paddedMessage) { lock (SESSION_LOCK) { SessionRecord sessionRecord = sessionStore.loadSession(remoteAddress); SessionState sessionState = sessionRecord.getSessionState(); ChainKey chainKey = sessionState.getSenderChainKey(); MessageKeys messageKeys = chainKey.getMessageKeys(); ECPublicKey senderEphemeral = sessionState.getSenderRatchetKey(); uint previousCounter = sessionState.getPreviousCounter(); uint sessionVersion = sessionState.getSessionVersion(); byte[] ciphertextBody = getCiphertext(sessionVersion, messageKeys, paddedMessage); CiphertextMessage ciphertextMessage = new WhisperMessage(sessionVersion, messageKeys.getMacKey(), senderEphemeral, chainKey.getIndex(), previousCounter, ciphertextBody, sessionState.getLocalIdentityKey(), sessionState.getRemoteIdentityKey()); if (sessionState.hasUnacknowledgedPreKeyMessage()) { SessionState.UnacknowledgedPreKeyMessageItems items = sessionState.getUnacknowledgedPreKeyMessageItems(); uint localRegistrationId = sessionState.getLocalRegistrationId(); ciphertextMessage = new PreKeyWhisperMessage(sessionVersion, localRegistrationId, items.getPreKeyId(), items.getSignedPreKeyId(), items.getBaseKey(), sessionState.getLocalIdentityKey(), (WhisperMessage)ciphertextMessage); } sessionState.setSenderChainKey(chainKey.getNextChainKey()); sessionStore.storeSession(remoteAddress, sessionRecord); return(ciphertextMessage); } }
/** * Encrypt a message. * * @param paddedMessage The plaintext message bytes, optionally padded to a constant multiple. * @return A ciphertext message encrypted to the recipient+device tuple. */ public CiphertextMessage encrypt(byte[] paddedMessage) { lock (SESSION_LOCK) { SessionRecord sessionRecord = sessionStore.LoadSession(remoteAddress); SessionState sessionState = sessionRecord.getSessionState(); ChainKey chainKey = sessionState.getSenderChainKey(); MessageKeys messageKeys = chainKey.getMessageKeys(); ECPublicKey senderEphemeral = sessionState.getSenderRatchetKey(); uint previousCounter = sessionState.getPreviousCounter(); uint sessionVersion = sessionState.getSessionVersion(); byte[] ciphertextBody = getCiphertext(messageKeys, paddedMessage); CiphertextMessage ciphertextMessage = new SignalMessage(sessionVersion, messageKeys.getMacKey(), senderEphemeral, chainKey.getIndex(), previousCounter, ciphertextBody, sessionState.getLocalIdentityKey(), sessionState.getRemoteIdentityKey()); if (sessionState.hasUnacknowledgedPreKeyMessage()) { SessionState.UnacknowledgedPreKeyMessageItems items = sessionState.getUnacknowledgedPreKeyMessageItems(); uint localRegistrationId = sessionState.GetLocalRegistrationId(); ciphertextMessage = new PreKeySignalMessage(sessionVersion, localRegistrationId, items.getPreKeyId(), items.getSignedPreKeyId(), items.getBaseKey(), sessionState.getLocalIdentityKey(), (SignalMessage)ciphertextMessage); } sessionState.setSenderChainKey(chainKey.getNextChainKey()); if (!identityKeyStore.IsTrustedIdentity(remoteAddress, sessionState.getRemoteIdentityKey(), Direction.SENDING)) { throw new UntrustedIdentityException(remoteAddress.Name, sessionState.getRemoteIdentityKey()); } identityKeyStore.SaveIdentity(remoteAddress, sessionState.getRemoteIdentityKey()); sessionStore.StoreSession(remoteAddress, sessionRecord); return(ciphertextMessage); } }